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PDF SGM3142 Data sheet ( Hoja de datos )
| Número de pieza | SGM3142 | |
| Descripción | 6-Channel Charge Pump White LED Driver | |
| Fabricantes | Shengbang Microelectronics | |
| Logotipo |  |
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SGM3142
6-Channel Charge Pump White LED
Driver with Low Dropout Current Source
GENERAL DESCRIPTION
The SGM3142 is a high efficiency and cost effective
charge pump white LED driver. It supports up to 6 white
LEDs and regulates a constant current for uniform
intensity. The part maintains the high efficiency by
utilizing a 1×/1.5× fractional charge pump and low
dropout current sources. The small equivalent 1× mode
open loop resistance and ultra-low dropout voltage of
current source extend the operating time of 1× mode
and optimize the efficiency of Li-ion battery in white
LED applications.
User can easily configure each LED current from
1.25mA to 20mA by a pulse dimming control. The
dimming of white LEDs current can be achieved by
applying a pulse signal to the EN/SET pin. There are
totally 16 steps of current could be set by users. The
operating voltage range is 2.7V to 5.5V. Internal
soft-start circuitry effectively reduces the in-rush
current while both start-up and mode transition.
The SGM3142 is available in Green TQFN-4×4-16L
package and is specified over an ambient temperature
range of -40℃ to +85℃.
FEATURES
● Input Voltage Range: 2.7V to 5.5V
● Drives up to 6 LEDs at 20mA Each
● 16-Step Brightness Control
● High Efficiency by Fractional Conversion with
1× and 1.5× Modes
● Automatic Charge Pump Mode Selection
● Switching Frequency: 1MHz
● 1% Typical LED Current Matching
● Internal Soft-Start Limits Inrush Current
● Low Input Noise and Low EMI
● Over-Current and Over-Temperature Protection
● Output Over-Voltage Protection
● Under-Voltage Lockout with Hysteresis
● Available in Green TQFN-4×4-16L Package
APPLICATIONS
White LED Backlighting
White Photo-Flash for DSCs
Color (RGB) Lighting
Programmable Current Source
SG Micro Corp
www.sg-micro.com
REV. A. 2
1 page  
SGM3142
6-Channel Charge Pump White LED Driver
with Low Dropout Current Source
TYPICAL PERFORMANCE CHARACTERISTICS
CIN = COUT = C1 = C2 = 1μF, TA = +25℃, unless otherwise noted.
Efficiency vs. Input Voltage (6×20mA)
100
90
80
70
60
50
VDIODE = 3.25V
40
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
SG Micro Corp
www.sg-micro.com
Efficiency vs. Input Voltage (6×10mA)
100
90
80
70
60
50
VDIODE = 3.1V
40
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
5
5 Page 
SGM3142
6-Channel Charge Pump White LED Driver
with Low Dropout Current Source
APPLICATION INFORMATION
Driving Multiple LED's, White LED Display
Module Back Lights
The SGM3142 LED1 to LED6 outputs are true constant
current sources capable of driving up to 20mA each over
the operation input voltage range. Since these outputs
are true constant current sources, they may be
connected in parallel to drive a single power output. Any
combination of outputs (LED1 to LED6) may be
connected in parallel. The maximum total output current
is a sum of how many current sources are parallel
connected. This feature is particularly useful to power
pre-manufactured display modules which are pre-wired
with white LED backlights connected in a parallel circuit
configuration. Any combination of outputs may be
connected in parallel to drive groups of LED's. The
SGM3142 internal current source reference circuit bases
feedback from current sensed on the LED1 and LED5
outputs. For best operation, the only requirement for this
type of application is the output LED1 and LED5 should
always be connected to the load circuit.
The SGM3142 may be used to drive multiple LED's
having differing forward voltages. Using feedback
techniques, the current in LED1 to LED4 output currents
sources are referenced to the current in the LED
connected to LED1. The LED5 and LED6 output current
sources are referenced to the current in LED5, not to
LED1. If all six LED's are of similar type, the diodes will
be matched in current, maintaining uniform LED
brightness despite variations in manufacturer, production,
etc.
SG Micro Corp
www.sg-micro.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SGM3142.PDF ] | |
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